I am stumped then, I just tested it on a couple of other websites with flash banners at the top of the page and the problem occurs there as well, if flash is enabled the page blurs when scrolling until you scroll up and down slightly, with flash disabled no such issue. Are you testing it on Windows or OSX though?

I am stumped then, I just tested it on a couple of other websites with flash banners at the top of the page and the problem occurs there as well, if flash is enabled the page blurs when scrolling until you scroll up and down slightly, with flash disabled no such issue.